Ted Smith saidYes just removing two per channel will make the attenuator do about -12dB instead of -20dB.
I decided to only remove 1 of the 3 resistors in parallel at first. That is 4 resistors altogether. Each channel has 2 shunts to ground since it is balanced.
So the shunt to ground is now 23.5 ohms instead of the 15. This has resulted in an increase in level of 3.2dB. I think this increase will be enough for me. It keeps my typical level in the low 90s instead of the high 90s. Which means I no longer hear those pops with SACDs that sometimes occur at a level about 98 and above.
Thanks to Ted for the information on how to do this.